Fix tree view indentation and kanban subtask handling

Tree View:
- Fix nested task indentation to scale properly with depth (1.5rem per level)
- Sub-subtasks now indent correctly relative to their parents

Kanban View:
- Show ALL tasks as draggable cards (not just root tasks)
- Subtasks display parent task name for context
- Each subtask can be independently dragged to different status columns
- Remove nested subtask expansion since all tasks are now individual cards

frontend/src/components/TreeView.jsx

@@ -85,9 +85,8 @@ function TaskNode({ task, projectId, onUpdate, level = 0 }) {
   return (
     <div className="mb-2">
       <div
-        className={`flex items-center gap-2 p-3 bg-cyber-darkest border border-cyber-orange/20 rounded hover:border-cyber-orange/40 transition-all group ${
-          level > 0 ? 'ml-6' : ''
-        }`}
+        style={{ marginLeft: `${level * 1.5}rem` }}
+        className="flex items-center gap-2 p-3 bg-cyber-darkest border border-cyber-orange/20 rounded hover:border-cyber-orange/40 transition-all group"
       >
         {/* Expand/Collapse */}
         {hasSubtasks && (
@@ -176,7 +175,7 @@ function TaskNode({ task, projectId, onUpdate, level = 0 }) {
 
       {/* Add Subtask Form */}
       {showAddSubtask && (
-        <div className={`mt-2 ${level > 0 ? 'ml-6' : ''}`}>
+        <div style={{ marginLeft: `${level * 1.5}rem` }} className="mt-2">
           <form onSubmit={handleAddSubtask} className="flex gap-2">
             <input
               type="text"